i2c: i2c-eg20t: do not print error message in syslog if no ACK received

Using the i2c-eg20t driver and call i2cdetect or probe on the bus,
the driver will print a lot of error messages if there was no ACK
received.

i2cdetect normally print a table with all the available devices. If there
is no device on the address, the table will be empty.
Currently with the i2c-eg20t driver, the table is not visible because
the error messages destroy the table.

Error message: pch_i2c_getack return -71

This patch prevent the driver to print the messages to syslog.
The pch_i2c_wait_for_check_xfer function is the only one who is
calling pch_i2c_getack, so we can delete the function and add the
read to pch_i2c_wait_for_check_xfer.
If no ACK is received, the Message will be printed as a dbg
message.

Fixed print message to be a one liner so we can grep for the
error message.

Tested on Intel Atom E6xx and Eg20t Chipset.

Signed-off-by: Andreas Werner <wernerandy@gmx.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 0f37529..ff15ae9 100644 (file)
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -311,24 +311,6 @@ static void pch_i2c_start(struct i2c_algo_pch_data *adap)
        pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
 }
 
-/**
- * pch_i2c_getack() - to confirm ACK/NACK
- * @adap:      Pointer to struct i2c_algo_pch_data.
- */
-static s32 pch_i2c_getack(struct i2c_algo_pch_data *adap)
-{
-       u32 reg_val;
-       void __iomem *p = adap->pch_base_address;
-       reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK;
-
-       if (reg_val != 0) {
-               pch_err(adap, "return%d\n", -EPROTO);
-               return -EPROTO;
-       }
-
-       return 0;
-}
-
 /**
  * pch_i2c_stop() - generate stop condition in normal mode.
  * @adap:      Pointer to struct i2c_algo_pch_data.
@@ -344,6 +326,7 @@ static void pch_i2c_stop(struct i2c_algo_pch_data *adap)
 static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap)
 {
        long ret;
+       void __iomem *p = adap->pch_base_address;
 
        ret = wait_event_timeout(pch_event,
                        (adap->pch_event_flag != 0), msecs_to_jiffies(1000));
@@ -366,10 +349,9 @@ static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap)
 
        adap->pch_event_flag = 0;
 
-       if (pch_i2c_getack(adap)) {
-               pch_dbg(adap, "Receive NACK for slave address"
-                       "setting\n");
-               return -EIO;
+       if (ioread32(p + PCH_I2CSR) & PCH_GETACK) {
+               pch_dbg(adap, "Receive NACK for slave address setting\n");
+               return -ENXIO;
        }
 
        return 0;